Novatel 01018518 User Manual

This command allows you to dictate how the receiver handles Satellite Based Augmentation System 
(SBAS) corrections. The receiver automatically switches to Pseudorange Differential (RTCM or 
RTCA) or RTK if the appropriate corrections are received, regardless of the current setting.

To enable the position solution corrections, you must issue the SBASCONTROL ENABLE 
command. The GPS receiver does not attempt to track any GEO satellites until you use the 
SBASCONTROL command to tell it to use either WAAS, EGNOS, or MSAS corrections.

When in AUTO mode, if the receiver is outside the defined satellite system’s corrections grid, it 
reverts to ANY mode and chooses a system based on other criteria.

Once tracking satellites from one system in ANY or AUTO mode, it does not track satellites from 
other systems. This is because systems such as WAAS, EGNOS and MSAS do not share broadcast 
information and have no way of knowing each other are there.

The “testmode” parameter in the example is to get around the test mode of these systems. EGNOS at 
one time used the IGNOREZERO test mode. At the time of printing, ZEROTOTWO is the correct 
setting for all SBAS, including EGNOS, running in test mode. On a simulator, you may want to leave 
this parameter off or specify NONE explicitly.

When you use the SBASCONTROL command to direct the GPS receiver to use a specific correction 
type, the GPS receiver begins to search for and track the relevant GEO PRNs for that correction type 
only.

You can force the GPS receiver to track a specific PRN using the ASSIGN command. You can force 
the GPS receiver to use the corrections from a specific SBAS PRN using the SBASCONTROL 
command.

Disable stops the corrections from being used.

sbascontrol keyword [system] [prn] [testmode]